STYRON, R. A.; PEASANT, E. J. Improving Student Achievement: Can Ninth Grade Academies Make A Difference?. International Journal of Education Policy and Leadership, [S. l.], v. 5, n. 3, 2010. DOI: 10.22230/ijepl.2010v5n3a179. Disponível em: https://ijepl.journals.publicknowledgeproject.org/index.php/ijepl/article/view/179. Acesso em: 5 may. 2026.